Proksimal Optimizasyon Tekniği
Özet
Proksimal Optimizasyon Tekniği (POT), koroner bifurkasyon lezyonlarında ana damarın proksimal ve distal kesimleri arasındaki çap farkını telafi etmek amacıyla 2008 yılında Dr. Olivier Darremont tarafından tanımlanmıştır. Murray Yasası, Finet ve Huo-Kassab formüllerine dayanan bu yöntem, hem tek hem de çift stent stratejilerinde ana damar stent malapozisyonunu ve subluminal tekrar tellenme riskini azaltırken, yan dal ostiumundaki stent hücrelerini açarak kılavuz tel geçişini kolaylaştırmakta ve akış dinamiklerini optimize etmektedir. Klinik uygulamalarda basitliği nedeniyle Finet formülü yaygın olarak tercih edilse de, kalsifik lezyonlarda net damar çapı değerlendirmesi için intravasküler ultrason (IVUS) yapılması gerekmektedir. POT işleminde genellikle kısa non-kompliyan (NC) balonlar tercih edilir ve balonun distal işaretçisinin karina veya neokarina seviyesine dikey açılardan tam olarak hizalanması, karinal şifti ve yan dal obstrüksiyonunu önlemek açısından kritiktir. Avrupa Bifürkasyon Kulübü (EBC) ve Avrupa Kardiyoloji Derneği (ESC) kılavuzlarınca rutin olarak önerilen POT, tek stent yönteminde stent yerleşiminin ardından uygulanırken, çift stent stratejilerinde ise tekrar kılavuz telle geçiş (rewiring) öncesinde ve nihai kissing balon dilatasyonu sonrasında eliptik deformasyonu düzeltmek adına sürecin ayrılmaz bir parçasıdır.
The Proximal Optimization Technique (POT) was defined by Dr. Olivier Darremont in 2008 to compensate for the diameter mismatch between the proximal and distal segments of the main vessel in coronary bifurcation lesions. Based on Murray’s Law, Finet, and Huo-Kassab formulas, this method reduces main vessel stent malapposition and the risk of subluminal rewiring, opens stent cells over the side branch ostium to facilitate guide wire re-entry, and optimizes final flow dynamics in both single and double stent strategies. While the Finet formula is widely preferred in clinical practice due to its simplicity, intravascular ultrasound (IVUS) must be performed for accurate vessel diameter assessment in calcified lesions. POT typically utilizes short non-compliant (NC) balloons, and precisely aligning the distal balloon marker at the carina or neocarina level using orthogonal angiographic views is critical to prevent carina shift and side branch obstruction. Routinely recommended by the European Bifurcation Club (EBC) and European Society of Cardiology (ESC) guidelines, POT is performed following stent deployment in single stent pathways, whereas in double stent strategies, it serves as an integral step both prior to rewiring and after final kissing balloon dilatation to correct elliptical deformation.
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